--- Come on, please give me some ideas about the project.---Sorry. With so much work ____ my mind, l almost break down..

With efforts _______ conservation, we may believe that people enjoy a healthy life without the environment around them ________. 

no modern technology, the Egyptians had to move each stone by hand.

With a lot of problems _______, the principal decided to hold a meeting to have a discussion about them

The company in Suzhou produced quantities of first-class silk, most of them  ____ to Europe.